package com.xz.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.xz.reggie.common.CustomException;
import com.xz.reggie.dto.SetmealDto;
import com.xz.reggie.entity.Dish;
import com.xz.reggie.entity.Setmeal;
import com.xz.reggie.entity.SetmealDish;
import com.xz.reggie.mapper.SetmealMapper;
import com.xz.reggie.service.SetmealDishService;
import com.xz.reggie.service.SetmealService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

/**
 * @author 许正
 * @version 1.0
 */
@Service
@Slf4j
public class SetmealServiceImpl extends ServiceImpl<SetmealMapper, Setmeal> implements SetmealService {

    @Autowired
    private SetmealDishService setmealDishService;

    /**
     * 新增套餐, 同时需要保存套餐和菜品的关联关系
     *
     * @param setmealDto
     */
    @Transactional
    @Override
    public void saveWithDish(SetmealDto setmealDto) {
        //保存套餐的基本信息, 操作setmeal, 执行insert操作
        this.save(setmealDto);

        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
//        setmealDishes.forEach(o -> {
//            o.setSetmealId(setmealDto.getId());
//        });

        setmealDishes = setmealDishes.stream().map((item) -> {
            item.setSetmealId(setmealDto.getId());
            return item;
        }).collect(Collectors.toList());


        //保存套餐和菜品的关联信息, 操作setmeal_dish, 执行insert操作
        setmealDishService.saveBatch(setmealDishes);
    }

    /**
     * 删除套餐,同时删除套餐和菜品的关联数据
     *
     * @param ids
     */
    @Override
    @Transactional
    public void removeWithDish(List<Long> ids) {
        //select count(*) from setmeal where id in (1,2,3) and status = 1
        //查询套餐状态, 确定是否可以删除
        LambdaQueryWrapper<Setmeal> setmealLambdaQueryWrapper = new LambdaQueryWrapper<>();
        setmealLambdaQueryWrapper.in(Setmeal::getId, ids).eq(Setmeal::getStatus, 1);

        int count = this.count(setmealLambdaQueryWrapper);

        if (count > 0) {
            //如果不能删除, 就抛出一个业务异常
            throw new CustomException("有套餐正在售卖,不能删除!");
        }

        //如果可以删除, 先删除套餐表中的数据, 再删除关系表中的数据
        this.removeByIds(ids);

        //delete from setmeal_dish where setmeal in (1,2,3)
        LambdaQueryWrapper<SetmealDish> setmealDishLambdaQueryWrapper = new LambdaQueryWrapper<>();
        setmealDishLambdaQueryWrapper.in(SetmealDish::getSetmealId, ids);
        setmealDishService.remove(setmealDishLambdaQueryWrapper);
    }

    /**
     * 根据id套餐信息和对应的套餐中的菜品信息
     *
     * @param id
     */
    @Override
    public SetmealDto getByIdWithDish(Long id) {
        Setmeal setmeal = this.getById(id);
        SetmealDto setmealDto = new SetmealDto();
        BeanUtils.copyProperties(setmeal, setmealDto);

        LambdaQueryWrapper<SetmealDish> dishLambdaQueryWrapper = new LambdaQueryWrapper<>();
        dishLambdaQueryWrapper.eq(SetmealDish::getSetmealId, setmeal.getId());

        List<SetmealDish> setmealDishes = setmealDishService.list(dishLambdaQueryWrapper);
        setmealDto.setSetmealDishes(setmealDishes);

        return setmealDto;
    }

    /**
     * 更新套餐信息,同时更新对应的菜品信息
     *
     * @param setmealDto
     */
    @Override
    public void updateWithDish(SetmealDto setmealDto) {
        this.updateById(setmealDto);

        LambdaQueryWrapper<SetmealDish> setmealDishLambdaQueryWrapper = new LambdaQueryWrapper<>();
        setmealDishLambdaQueryWrapper.eq(SetmealDish::getSetmealId, setmealDto.getId());
        setmealDishService.remove(setmealDishLambdaQueryWrapper);

        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();

        setmealDishes = setmealDishes.stream().map((item) -> {
            item.setSetmealId(setmealDto.getId());
            return item;
        }).collect(Collectors.toList());

        setmealDishService.saveBatch(setmealDishes);
    }
}
